If you are a traveler, then you don't need to open a bank account. For more banking specifics, feel free to ask us. 

如果你是一个旅行者，那么你不需要开立银行账户。想了解更多银行的具体情况，请随时向我们咨询。

"Do you exchange foreign currency?" 

你们兑换外币吗？

"What is your exchange rate for the Korean Won?" 

韩元的兑换汇率是多少？

"Can I cash my traveler's checks here?"  

我能在这里兑现旅行支票吗？

"The exchange rate is .0009 cents for one won."  

兑换汇率是一韩元兑换0.0009美分。

"I would like to exchange 500,000 won please." 

我想要兑换5万韩元。

"500,000 won at the current exchange rate is $450. Here you go."  

50万韩元按照当前汇率是兑换450美元，给你。